/5 Science Quiz (for 12 to 16 years old): Quiz 20 1 / 5Which metal pollute the air of a big city? Cadmium Copper Lead Chromium 2 / 5Which of the following is an element? Emerald Ruby Sapphire Diamond 3 / 5Which of the following is the lightest metal? Silver Lead Mercury Lithium 4 / 5LPG consists of mainly methane, butane and propane methane, hexane and nonane ethane, hexane and nonane methane, ethane and hexane 5 / 5In fireworks, the green flame is produced because of barium mercury potassium sodium Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback
